A remote user can create specially crafted HTML that, when loaded by the target user, will cause the target user's browser to become unresponsive. The browser will restart and display an error message. (KB24841-Partial Denial of Service (DoS) in the BlackBerry browser application)

There are fixes from RIM BUT BUT only for OS 5 and OS 6 !!

the OS 4xxx is now UNSUPPORTED ! as explain by RIM :

"RIM has issued a software update that resolves this issue in BlackBerry Device Software versions later than 5.0.0. BlackBerry Device Software version 4.7.0 and earlier is unsupported"

OK you don't see my point ( sorry for my bad American/English, it is not one of my main languages).

- you point on windows 95, can I remind you that is was made available in 1995, 16 years ago, I can understand that microsoft ( which is not building his image on security ) stop the security updates.

- After 95 there was NT, 98, 98SE, NT4, millenium, 2000, XP, Vista and 7. If you take only XP which was made available in 2002 ( 9 years ago ). Even if it is not officially supported by Microsoft , I get the security updates on our computers every first tuesday. NOT bad for an unsupported product from a company that is not building on security...

- We bought the last batch of blackberries 81xx and 83xx in 2010 ( yes well known operators sell them ), and now one year later no more security support !

really BAD for a company

BUT deadly shocking from a company building his image on security

Can I remind you that there are several millions of blackberry 81xx and 83xx still used by RIM customers .
I can understand that they can't get OS5 because of memory constraints, BUT I can't understand the NO security support from RIM.

So YES the security image of RIM is not anymore, sorry for that, they are now just one of those...

I just picked Win95 as it was first to mind as an OS that is at (actually way beyond) end of life. To me older 4.X OS devices are not any different, especially in the smart phone arena where today's new is old in eighteen months.

In the bigger scheme of things, a DoS issue isn't great, but it also doesn't strike me as catastrophic.

RIM obviosly made a cost benefit decision. It's fair to make your own assessment and do what is best for you and/or your business.

In my mind I still put RIM's security consciousness and practices way, way above the competition.Posted via BlackBerryForums.com Mobile

I find it ODD how a retailer provider or authorized 3rd party or direct channel found it reasonable to sell you such old units: 83xx units are at least 2yrs old now; and did they state how long warranty is supported and guaranteed for?! Why didn't you purchase the most recent curve models? or 1 generation behind?!

These 83xx were still available six months ago at the operator shop. So we bought them for our teams.
Why them, just because they have all what we need ( mail security and stability ) and they have the BEST keyboard ( from my point of view better than the 9520, the 9300 and the 9700 ) and the price was nice ( important for a small company).

As they are still under waranty we may ask the operator to change them or refund.

My first two BlackBerrys I bought when they were soon to be taken off the retail market and T-Mobile was practically giving them away. It was a good deal for me as far as $'s, but there are downsides as the OP has found.